Power bank



FIG. 1 is a perspective view of a first embodiment of my new design;

FIG. 2 is a front view of the first embodiment of my new design;

FIG. 3 is a back view of the first embodiment of my new design;

FIG. 4 is a left side view of the first embodiment of my new design;

FIG. 5 is a right side view of the first embodiment of my new design;

FIG. 6 is a top view of the first embodiment of my new design;

FIG. 7 is a bottom side view of the first embodiment of my new design;

FIG. 8 is a perspective view of a second embodiment of my new design;

FIG. 9 is a front view of the second embodiment of my new design;

FIG. 10 is a back view of the second embodiment of my new design;

FIG. 11 is a left side view of the second embodiment of my new design;

FIG. 12 is a right side view of the second embodiment of my new design;

FIG. 13 is a top view of the second embodiment of my new design; and,

FIG. 14 is a bottom side view of the second embodiment of my new design.

The broken lines in the drawings are for the purpose of illustrating unclaimed portions of the power bank and form no part of the claimed design. 

CLAIM The ornamental design for an power bank, as shown and described. 